package com.example.zuoye;


import java.util.Arrays;
import java.util.List;
import java.util.Optional;

import static java.util.Comparator.comparing;
import static java.util.stream.Collectors.toList;

public class Test {
    public static void main(String[] args) {
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario","Milan");
        Trader alan = new Trader("Alan","Cambridge");
        Trader brian = new Trader("Brian","Cambridge");
        List<Transaction> transactions = Arrays.asList(
                new Transaction(brian, 2011, 300),
                new Transaction(raoul, 2012, 1000),
                new Transaction(raoul, 2011, 400),
                new Transaction(mario, 2012, 710),
                new Transaction(mario, 2012, 700),
                new Transaction(alan, 2012, 950)
        );

        //(1) 找出2011年发生的所有交易，并按交易额排序（从低到高）。
        List<Transaction> tr2011 = transactions.stream().filter(transaction -> transaction.getYear() ==2011)
                .sorted(comparing(Transaction::getValue)).collect(toList());
        System.out.println(tr2011);

        //(2) 交易员都在哪些不同的城市工作过？
        List<String> collect = transactions.stream().map(transaction -> transaction.getTrader().getCity()).distinct().collect(toList());
        System.out.println(collect);

        //(3) 查找所有来自于剑桥的交易员，并按姓名排序。
        List<Trader> cambridge = transactions.stream().map(Transaction::getTrader)
                .filter(trader -> trader.getCity().equals("Cambridge")).sorted(comparing(Trader::getName))
                .collect(toList());
        System.out.println(cambridge);

        //(4) 返回所有交易员的姓名字符串，按字母顺序排序。
        String reduce = transactions.stream().map(transaction -> transaction.getTrader().getName())
                .distinct().sorted().reduce("", (n1, n2) -> n1 + n2);
        System.out.println(reduce);

        //(5) 有没有交易员是在米兰工作的？
        boolean milan = transactions.stream().anyMatch(transaction -> transaction.getTrader()
                .getCity().equals("Milan"));
        System.out.println(milan);

        //(6) 打印生活在剑桥的交易员的所有交易额。
        transactions.stream().filter(transaction -> "Cambridge".equals(transaction.getTrader().getCity())).
                map(Transaction::getValue).forEach(System.out::println);

        //(7) 所有交易中，最高的交易额是多少？
         Optional<Integer> reduce1 = transactions.stream().map(Transaction::getValue).reduce(Integer::max);
        System.out.println(reduce1);


        //8) 找到交易额最小的交易。
        Optional<Transaction> min = transactions.stream().min(comparing(Transaction::getValue));
        System.out.println(min);
    }
}
